Apple Computer is readying a faster version of its top-selling iMac computer and may add two new colors within several weeks, sources said. The computer-maker is expected to introduce a 333-MHz desktop computer that displaces the original 266-MHz model. Both cost $1,199.

Meanwhile, rumors persist that Apple will unveil banana- and cherry-colored models to replace its slower-selling tangerine and strawberry iMacs. Blueberry is the most popular color among the current lineup, according to dealers. Apple declined to comment.